Pulsator for pulsatory tools.



A. H. GIBSON.

PULSATOR FOR PULSATORY TOOLS.

APPLICATION FILED SEPT- 7. 1912.

Patented Aug. 31, 1915.

Ill 111mg 2 yitraoeo gvwemto'z M @311: W W Q54 $51 61mm COLUMBIAPLANDURAPH COUWASHINGTDN, D. C.

COMPANY, OF NEW YORK, N. Y., A CORPORATION. OF NEW JERSEY.

PULSAITOLR FOR riiLsAToavmooLs.

To all whom it may concern:

Be it known that I,'-ARTHUR H. GIBsoN, a subject of the King of GreatBritain, residing at Easton, in the "county of Northment in Pulsatorsfor PulsatoryTools, of which the following is a specification.

This invention relates to pulsators for use with percussive toolsoperated by pulsating columns of air and more particularly to a machineof this type adapted to run at high speed for use with tools of thehammer type.

Pulsators as at present constructed, cannot be run over a certaincomparatively low speed, say five hundred reciprocations per minute, thevibrations at speeds above this being so-great as to render the devicesimpractical.

The object of the present invention is to construct a pulsator which canbe operated at twelve hundred reciprocations or over, a minute, and bedirectly connected with an electric motor, without the objectionablevibration accompanying the present designs. With this object in View Ihave devised a pulsator, a practical embodiment of which is shown in theaccompanying drawings, in which:

Figure 1 shows a vertical longitudinal section through the pulsator end,and Fig. 2 shows a similar horizontal section on the line IIII of Fig.1.

The pulsator as shown comprises two cylinders 12 directly opposed in ahorizontal line and slightly ofiset vertically. The inner portions 34 ofeach of the cylinders are of smaller diameters. In each cylinder arepistons 5-6 having a head sliding in the larger diameter portion of thecylinder and a smaller portion sliding in the inner portion of itscylinder. Immediately between the cylinders and in direct line with thepistons is a shaft 7 driven preferably directly from an electric motor(not shown). Driving means for reciprocating the pistons in oppositedirections are operated from the shaft 7. As shown this drivingmechanism consists of connecting rods 8-9 pivotally mounted on crosspins 10-11 in the smaller portion of the piston, the connecting rodshaving at their inner ends circular straps 1213 which surroundoppositely mounted circular eccentric cams Application filed September7, 191 2. SeriaINo. 719,185.

Specification of Letters Patent Patented Aug; 31,1915,

14%15 secured to the shaft 7. The form of driving mechanism isimmaterial however, the essential feature being that the shaft isdirectly in line with thepistons. ampton and State of Pennsylvania, have.invented a certain new and useful Improve- The outer ends of each ofthe cylinders serve as pulsating chambers, and are provided with pipes16- -17 which come together and lead by a single pipe 18 to the tool tobe operated (notshown). The device; as shown is designed for use withwhat is known as a one hose tool and for this purpose the pipe 18 is theonly connection needed. If however it is desired to convey air to bothsides of thetool piston, a second pipe 19 can be attached to thespa'cebetween the cylinders in which the air is also alterordinarycircumstances this is closed.

In order to provide air to build up and opening maintain pressure in thesystem, the an-' nular pressure chambers formed by the shoulders of thepistons in the large diameter portions of the cylinders are used as apumping means, air being taken in at the outer end of the piston strokethrough ports 2021 and delivered to the other side of the pistons to thepulsating chambers by passages 2223 which just bridge the pistons at theinner end of their stroke.

It is to be understood thatthe present showing and description disclosesonly one specified modification of my invention and other forms andmodifications are included inthe spirit and scope of the invention asexpressed in the claims.

What I claim is:

1. In a pulsator for pulsatory tools, two opposed cylinders, pistons insaid cylinders having shoulders dividing each of said cylsrarns i PATroFFIon -f ARTHUR HENRY GIBSON, or EASTON, PENNSYLVANIA, ASSIGNOR ToInGEnsoLL-RAND 'nately compressed and expanded. Under bets; a shaft inline with saidpiston and operative connections between said shaft andpistons for reciprocating said pistons simultaneously in oppositedirections.

3. In a pulsator for pulsatory tools, two' ing chambers of differentVolume, a shaft 1n llne w1th sald plstons, and operative connectionsbetween said shaft and said pistons 15 for reciprocating the pistons inopposite directions.

In testimony whereof, I have hereunto set ,my hand.

ARTHUR HENRY GIBSON.

Witnesses:

E. APGAR, .ROBERT E. KIEFFER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

' Washington, D. C.

